78.57% is the change from 280 to 500
Calculation steps:
[( 500 - 280 ) ÷ 280] x 100 = 78.57%
Formula
Percentage change = [(500 - 280) / 280] x 100
Subtract the new number by the original number
500 - 280 = 220
220 ÷ 280 = 0.7857142857142857
0.7857142857142857 x 100 = 78.57%